While I can’t 100% say no, I’ve never seen one and I don’t imagine the field being a good fit for the bootcamp process. Nor do I view it as generally friendly to any sort of non traditional developer (including the swath of self taught ones)

Nearly all jobs I’ve seen related to firmware dev have been senior level, requiring many years of experience particularly in the domain the company operates in. I imagine there’s also a significant amount of knowledge that’s behind an NDA or is just not accessible to anyone outside the field. My hunch is that new talent is mostly obtained through university sourcing, but I could be wrong.

Of course, I’m not the one to tell you to just give up and settle, but if I were you I’d try to find a slightly less broad target and make a plan to hit it. If you fail, you fail and likely have achieved swaths of useless knowledge though.